Comment Re:How can it be both effective and invisible? (Score 2, Informative) 520
I remember many years ago on the Pennsylvania Turnpike after you exit the system you would get back a copy of the card it had some checkboxes next to a code on it like "Lost Ticket" etc. One of those was "excessive speed" I always figured it made some kind of calculation just like this.
That was before EZPass.